Mungindi is a town on the border of New South Wales (NSW) and Queensland. It is within Moree Plains Shire in New South Wales and within the Goondiwindi Region in Queensland. It possesses a New South Wales postcode. Mungindi sits on the Carnarvon Highway and straddles the Barwon River which is the border between New South Wales and Queensland. At the 2011 census, Mungindi had a population of 738 on the New South Wales side. The population on the Queensland side is now included in Thallon, which had a population, including the surrounding area, of 382.